3 EN does almost the same as 2 EN, so just make it 2 and put that special point somewhere else.
i've been meaning to make a sneaker/sniper myself but never knew how to start.
http://www.nitue.net/#fcp/direct!id=50085 9 2 1 10 9 5 Small frame+skilled
more crit@4, silent running @9, ghost@12, SD@16, better criticals@ 20, even more crit@24
227%SG for the 95% hit chance when shooting at eyes from 50 hex.
270% sneak, i'm pretty sure i read in the changelog that ghost gives a 30% bonus to sneak, not 40.
And even then i am not sure if this is always, as some say, or only when near walls or other solid objects.
By all means,
this build isn't finished yet;
If you depend on SD crit only, drop str to 3 and take weapon handling@4, pump those 2 points into EN imo.
Instead of even more critical you could pick brof, but it still would be a 1shot sniper.
If you're ok with shooting from less than 50 hexes, maybe even drop pe to 7 and get 6 EN.
For trading you'd have to get a special point from somewhere and make CH2 so that with a beer, you can talk to almost everyone. (iirc)
With this low carryweight i'd say just forget about crafting though, especially when dropping str to 3.
You could even make the build so that you can have a follower, a melee mutant who would act as a tank while you pew pew from distance but then again, no real need for sneak then.